in the 1.20.30 update I noticed one of my mobs got ejected out of a boat I had put it in, the mob was a magma. 

after waiting so long for it to get fixed I would keep checking my world on previews to make  sure it was safe to play and I wouldn't loose Any work. However upon loading my world in the 1.20.50.21  preview update it's got much worse now not only the magma has been ejected but most mobs I've collected has to. Some examples ravangers, polar bear, iron golem, horse, slime and many more.

This is a bug because there's been a recent change saying baby mobs that grow up In boats will now get ejected out of boats , however none of my mobs that's been ejected have ever been baby's in a boat they have always been fully grown I collected all big mobs in boats before they took to feature away to preserve them all in my museum as a new illegal formation mobs. 

the reason we really need this fixed is because me and a lot of other members of the community have built up museums to save all discontinued features ,illegal blocks,items and formations and of corse mobs . I physically cannot play my world until this gets fixed or I'm going to end up loosing alot of time and effort I put in to getting all the big mobs in boats. Thing is as I do a lot of vids of the discontinued feature topic slot of my subs will also have big mobs in boats in their own museums so it's gonna effect way more people than just me.